So, I've been on birth control pills for about five months now I guess. I started out taking them like I was suppose to, but I've always been pretty forget and I take them most days, but not always. Well I recently started a new job and I'm a full time student so I definitely haven't been taking my pills like I should. Sometimes I forget for days and then take one and forget for another few days, sometimes even a week. I just take them when I can remember, which I know is awful, but I really try. Anyways, I was supposed to start my period on the 27th of March, but it never came. I've already took one pregnancy test that came out negative, but I know that's not always 100% accurate. So, my question is how long should I wait for it to start or to take another test?